Fluid motor rotary actuator

Claim 1

A FLUID MOTOR ACTUATOR OF THE CHARACTER DESCRIBED COMPRISING; A HOUSING HAVING TOP, BOTTOM, SIDE AND END WALLS DEFINING A CLOSED CHAMBER; A POWER OUTPUT SHAFT ROTATABLY MOUNTED IN SAID CHAMBER WITH ONE END THEREOF EXTENDING OUT THROUGH ONE OF SAID SIDE WALLS, IN IDLER SHAFT ROTATABLY MOUNTED IN SAID CHAMBER IN SPACED PARALLEL RELATION TO SAID POWER OUTPUT SHAFT; A FIRST LAYER GEAR AND A FIRST SMALLER GEAR SECURED ON SAID POWER OUTPUT SHAFT WITHIN SAID CHAMBER, A SECOND LARGER GEAR WHICH IS SECURED ON SAID IDLER SHAFT IN MESH WITH SAID FIRST LARGER GEAR, A SECOND SMALLER GEAR WHICH IS SECURED ON SAID GEAR, SHAFT IN OPPOSED RELATION TO THE SAID FIRST SMALLER GEAR; AN UPPER FLUID PRESSURE CYLINDER SECURED TO THE TOP WALL OF SAID HOUSING AND EXTENDING UPWARDLY THEREFROM, AND A SIMILAR LOWER FLUID PRESSURE CYLINDER SECURED TO THE BOTTOM WALL OF SAID HOUSING AND EXTENDING DOWNWARDLY THEREFROM IN AXIAL ALIGNMENT WITH SAID UPPER CYLINDER, A PISTON SLIDABLY MOUNTED IN SAID UPPER CYLINDER, AND A SIMILAR PISTON SLIDABLY MOUNTED IN SAID LOWER CYLINDER; AN ELONGATED RACK MEANS INTERPOSED BETWEEN SAID FIRST AND SECOND SMALLER GEARS IN MESH WITH EACH OF SAID GEARS WITH THE UPPER END THEREOF EXTENDING UPWARDLY THROUGN AN APERTURE IN THE TOP WALL OF SAID HOUSING INTO SAID UPPER CYLINDER AND THE LOWER END THEREOF EXTENDING DOWNWARDLY THROUGH AN APERTURE IN THE BOTTOM WALL OF SAID HOUSING INTO SAID LOWER CYLINDER; AND MEANS BY WHICH FLUID UNDER PRESSURE IS ADAPTED TO BE SELECTIVELY SUPPLIED TO THE OUTER END OF ONE OF SAID CYLINDERS AND SIMULTANEOUSLY EXHAUSTED FROM THE OUTER END OF THE OTHER OF SAID CYLINDERS, WHEREBY SAID RACK MEANS IS ADAPTED TO BE RECIPROCATED THEREBY APPLYING TORQUE DIRECTLY TO SAID POWER OUTPUT SHAFT THROUGH SAID FIRST SMALLER GEAR AND INDIRECTLY THERETO THROUGH SAID SECOND SMALLER GEAR, SAID IDLER SHAFT, SAID SECOND LARGER GEAR AND SAID FIRST LARGER GEAR.